Grinding machine



July 27, 1937. Q G, FLYGARE 2,088,549

GRINDING MACHINE Filed Oct. 19, 1955 4 Sheets-Sheet 2 CARL G. F-LYGARE WITNESS *July 27, 1937. c. G. FLYGARE 2,088,549

GRINDING MACHINE Filed Oct. 19, 1935 4 Sheets-Sheet 3 WI TN E58 July 27, 1937. G FLYGARE 2,088,549

GRINDING MACHINE Filed Oct. 19, 1935 4 Sheets-Sheet 4 Patented July 27, 1937 i UNITED s'rr rt orriea GRINDING MACHINE tion of Massachusetts Application October 19, 1935, Serial No. 45,769

. 10 Claims.

This invention relates to grinding machines, and more particularly to a driving mechanism therefor.

One object of this invention is to provide a simple and thoroughly practicable driving mechanism for a grinding machine. Another object of this invention is to provide a readily removable grinding wheel assembly. Another object is to provide a driving mechanism for synchronizing the rotation of the grinding wheel and the work 'piece to be ground. A further object of this invention is to provide a synchronous driving connection between the grinding wheel and a truing apparatus therefor.

Another object of this invention is to provide a grinding machine driving mechanism in which the rotation of the grinding wheel, the rotation of the work piece, and the movement of the truing tool are all synchronized. Another object of this invention is to provide such a driving mechanism with readily detachable connections which permit ready removal of the grinding wheel assembly for changing the grinding wheel when desired. Other objects will be in part obvious or 25 in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and

30 the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary plan View ofa grinding machine embodying this invention, having parts broken away and shown in section to more clearly show the construction;

Fig. 2 is a left-hand elevation of the machine as shown in Fig. 1;

Fig. 3 is a sectional view taken approximately on the line 3-3 of Fig. 2, showing the synchronized drive between the wheel spindle and the work piece;

Fig. 4 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line l-4 of Fig. 2;

Fig. 5 is a fragmentary sectional View, on an enlarged scale, taken approximately on the line 50 55 of Fig. 4;

Fig. 6 is afragmentary sectional view, on an enlarged scale, of the adjustment for the driving gear, taken approximately on the line 6-4; of Fig. 5;

55 Fig. '7 is a fragmentary detail view, on an enlarged scale, of the backlash eliminating device in the gear drive;

Fig. 8 is a fragmentary front elevation of the end of the casing for the transverse drive shaft, as shown in Fig. 3;

Fig. 9 is a fragmentary cross-sectional view, taken approximately on the line 99 of Fig. 1, showing the operation of the grinding wheel truing mechanism;

Fig. 10 is a fragmentary longitudinal section, on an enlarged scale, taken approximately on the line Ill-I0 of Fig. 1;

Fig. 11 is a fragmentary end elevation of a portion of the work driving head, showing the work rotation brake;

Fig. 12 is a fragmentary elevation, on an enlarged scale, of the work driving head; and

Fig. 13 is a fragmentary view having parts broken away and cross-sectioned to show the work feeding mechanism.

The embodiment of this invention selected for illustration comprises a grinding machine having a base H] which supports a transversely movable carriage III on the ways l2, l3 and It. The carriage H in turn supports a longitudinally movable work supporting table l5 which is mounted to slide longitudinally thereon on V-way l6 and flat way IT. The table 15 supports a headstock l8 and footstock H) which serve as a rotatable support for a work piece, such as a camshaft 2D.

The base 18 is arranged to rotatably support a grinding wheel spindle 25 in suitable bearings 29 and 21. The wheel spindle 25 is provided with a wheel support which is arranged to support a plurality of grinding wheels 23 which in the form illustrated are non-circular in shape.

The grinding machine shown in this embodiment of the invention is particularly applicable to the type of machine shown in the prior patent to Stubbs No. 1,958,551 dated May 15, 1934, .in which a work piece of non-cylindrical shape is ground while mounted on centers by means of a plurality of grinding wheels, the peripheries of which are formed the conjugate in shape to that of the shape desired to be produced on the finished ground work piece.

The carriage l I is arranged to be moved transversely relative to the grinding wheels 28 to feed the work piece toward and from the peripheries of the wheels by means of a feeding mechanism, such as for example that shown in the prior U. S. patent to Wood No. 1,969,997 dated August 14, 1934. This mechanism may comprise a nut I with a rotatable feed screw 3| which may be rotated through a gear mechanism by a manually operable feed wheel 32. The details of this feed mechanism have not been fully illustrated since this mechanism is not considered part of the present invention. For further details of this mechanism, reference may be had to the prior patent to Wood above mentioned.

In a massive machine of this type, where the wheel spindle 25 is supported at its opposite ends by the bearings 26 and 21, it is desirable to provide a readily accessible means for removing the Wheel assembly to permit changing the grinding.

wheels when they become worn away. In the preferred form, the bearings at the opposite ends of the spindle 25 are supported in the cylindrically shaped casing members and 36. The base I8 is provided with a pair of opposed semicylindrical surfaces 37 and 38 which support the bearing casings 35 and 36, and a pair of readily removable bearing caps 39 and 49 serve to hold the bearing casings 35 and 36 in adjusted position on the base l8 by means of bolts 8!. The wheel spindle 25 is provided with reduced end portions 52 (only one of which is shown), and a pair of anti-friction bearings 45 and 46 are interposed between the reduced portion 42 of spindle 25 and the cylindrical bearing casing 35. This bearing construction is duplicated within the bearing casing 36. Only one of the bearings is shown in section to illustrate the construction. It Will be readily apparent from the foregoing disclosure that when it is desired to remove the wheel assembly for changing the grinding wheel,

the bolts ll and the bearing caps 39v and 48 are removed and the entire grinding wheel spindle assembly including the bearing casings 35 and 36 may be then readilylifted from the machine. The outside diameter of the bearing casings 35 and 36 is of such a size that the grinding wheel annulus may be readily slid axially from the assembly when they are changed. The wheel spindle 25 may be driven by means of a pulley 4'! from any suitable source of power.

In order that the grinding wheels 28 may be trued to the proper shape so that they are the conjugate of the work piece to be ground, a truing apparatus is provided comprising the transversely movable slide 56 which is arranged to be moved transversely on ways 5| of the base ill by means of a. feeding mechanism including a nut 52 carried by the slide 56. The nut 52 engages a feed screw 53 which is carried by the base It and is arranged to be rotated by a hand wheel 54.

The transversely movable slide 56 carries a longitudinally movable slide 58 mounted to slide longitudinally on ways 59 on the transversely movable slide 59. The slide 58 is arranged to be moved longitudinally on the carriage 56 by means ofv a hand wheel 66 which is supported on the outer end of a feedscrew 6| which in turn meshes with a nut 62 which is carried by the longitudinally movable slide 58.

The slide 58 supports a plurality of transversely movable truing tool slides 64, 65, 66 and 61, each of which is arranged to slide on slideways 68 within the slide 58. There is a truing-tool for each slide arranged opposite to each of the grinding wheels of the assembly.

In order that the truing tools may'true the peripheries of the wheels to a shape that is the conjugate of the work to be ground, a rotatable camshaft 69 carries a plurality of master cams '86, ll l2 and 73, each of which is arranged to engage a follower surface"! on its corresponding slide 65,

65, 66 and 61. One of the slide constructions is illustrated in detail, as shown in Fig. 9. A pair of springs l5 and I6 is interposed between each of the truing tool slides and the slide 58 which nor-- mally hold the truing tool slides 64, 65, 66 and 6'! in a forward position so that a follower surface 14 on each of the slides engages the corresponding cam '56, H, 12 and 73. The master camshaft 69 is rotated and this rotation serves to rotate the master cams to cause a transverse movement of the truing tool slides 68, 65, 66 and 61 so that the truing tools will generate a predetermined shape which is the conjugate of the work piece to be ground. The master camshaft 69 is rotatably supported in bearings ll, '18 and 19 in the slide 58 so that any rotation of the shaft 69 serves to cause a rotation of the master cams 19, H, 12 and 73 to move the truing tool slides 64, 65, 66 and 67, in accordance with the shape or contour of the master cams, to produce the desired shape upon the periphery of the grinding wheel.

In order that the non-circular grinding wheel 28 may produce a conjugate shape upon the periphery of the work piece being ground, it is necessary to synchronize the rotation of the grinding wheel with the rotatable Work support, and it is further necessary to synchronize the rotation of the master cams on the truing apparatus with the rotation of the grinding wheel, as well as the rotation of the work, in order that the grinding wheels may be trued to a proper shape or contour to produce the work of the desired shape. In the embodiment illustrated, the rotative power of the wheel spindle 25 is transmitted through a gear mechanism to rotate a transverse shaft which is connected through gearing to rotate both the work piece and the master camshaft of the truing mechanism. A gear casing 69 is mounted on a projecting boss 81 of the bearing casing 35 and is fixed thereto by means of screws so that the spindle bearing casing 35 and the gear casing form an integral unit.

A reduced portion 82- of the spindle 25 carries a bevel gear 83 which is keyed thereto by means of a key 84. The gear 83 meshes with a bevel gear 65 which is connected by a key 86 with a rotatable sleeve 81 supported in bearings 88 and 89 in gear casing 89.

A gear casing 99 is mounted on the transversely movable table II. The gear casing 98 carries a rotatable sleeve 9! which is supported in bearings 92 and 93. The sleeve 9! carries a bevel gear 94 which meshes with a bevel gear 95 which is keyed to a rotatable sleeve 96 journaled in the gear casing 90. I

The sleeve 96 is operatively connected to rotate a headstock sleeve 9? which is rotatably mounted within headstock l8. The headstock I8 is mounted on the longitudinally movable table I5 and the gear casing 96 is supported on the transversely movable slide l i so that it is necessary to provide a sliding driving connection between the sleeve 96 and the sleeve 9i. In the embodiment illustrated, a substantially triangularly shaped splined shaft 98 is utilized. This splined shaft is preferably made in accordance with the U. S. patent to Stubbs No. 1,912,412 dated June 6, 1933. The splined shaft 98 is connected to the sleeve 91 by means of a collar 99 within an aperture 09. The other end of the shaft 98 is slidably mounted in an aperture I 9! in the sleeve 96 which is shaped to fit the shaft 98 so as to permit a longitudinal movement of the headstock 98 relative to the gear casing 96. p

The'rotation of the headstock sleeve 91 and the Wheel spindle 25 are synchronized by connecting the rotatable sleeve 81 in the gear casing 88 with the rotatable sleeve iii in the gear casing ill] by means of a splineol shaft Hi2. The shaft Hi2 is held within an aperture M3 in sleeve SI by means of a rod I64 having a head I85 engaging a cover plate IMF at the end of sleeve .lI. A spring Iii? surrounds the rod IM and is interposed between the end cap Iilii and the shaft W2 and serves to hold the shaft in its normal driving position. The other end of the shaft i622 fits within an aperture it within the sleeve 87 and is arranged to slide within said aperture so as to permit a driving connection between the wheel spindle 25 and the headstock sleeve 9? during the transverse movement of the slide II.

It is desirable to provide a readily detachable driving connection between the gear box 88 and gear box 89 so that the driving connection may be readily disconnected when it is desired to remove the grinding wheel assembly from the machine. This is preferably accomplished by sliding the shaft Hi2 endwise toward the front of the machine; The end of the gear casing 98 is provided with a cover plate IIil which is pivotally connected thereto by means of a screw I l i. The cover plate is swung to a position so as to allow the shaft I02 to be withdrawn until the collar I05 projects beyond the cover plate Mil. The cover plate Iii] is then swung into position ilila so that the notch H2 engages the rod Iii l behind the collar 35. The operator may then turn the wheel 32 to move the transversely movable slide I II toward the left, as viewed in Fig. 13, through a sufficient distance to withdraw the shaft I52 from the aperture I98 in sleeve 8i, thereby disconnecting the driving connection between the gear box 8?! and the gear box 96 so as to permit the wheel spindle assembly to be readily removed from the machine. 7

In order that the rotation of the master camshaft 69 may be synchronized with the rotation of the grinding wheel spindle 25 and also with the rotation of the work piece 29, a gear box H5 is mounted on the transversely movable slide 50. The camshaft 6Q has a reduced end portion which is formed as a splined shaft HE arranged to slide within a central mating aperture in the rotatable sleeve ill in gear casing H5. A bevel gear H8 is keyed to the sleeve ill and meshes with a bevel gear IE9 which is carried by a rotatable sleeve i283 journaled within gear casing H5.

A shaft I2i serves to connect the sleeve I26 with the sleeve 8? in gear box 86 so as to transmit a rotary motion through bevel gears H9 and H8 to rotate the master camshaft 59 in synchronism with the wheel spindle 25. The shaft I2I is formed as a triangular splined shaft, 0 as above described, and as illustrated in Fig. 5,

having a portion slidably engaging a correspondingly shaped aperture H53 in the sleeve 8? and the other end portion of the shaft I2I is slidably mounted within a correspondingly shaped aperture I22 in the sleeve I28.

The shaft I2I is held in driving engagement with the sleeve Bl during the transverse move- I26 is swung on pivot screw I21 to open the central aperture and the shaft I 2! is moved rearwardly against the tension of the spring I24. The cover plate is then swung into position to engage a reduced portion I28 on the shaft I2I so as to lock the shaft in its rearward position. The operator may then manually turn the feed wheel 54 to move the truing apparatus slide 50 rearwardly so as to carry the gear box H5 and shaft iZI rearwardly until the shaft i2I disengages the sleeve 81 so as to permit ready removal of the gear box 89 with the grinding wheel assembly for changing of wheels.

In order that the sleeve 8'! in gear box may be readily aligned with shafts I02 and I2I when the grinding wheel assembly is removed and replaced, the gear box Si? is provided with a depending plate IBS having a locating surface I3I arranged to engage a locating bar I32 on the base Hi. When the grinding wheel assembly is inserted in the machine, the bearing casings 35 and 536 are lowered into their mating surfaces 31 and 38 and the locating surface ml of plate I3IJ engages the bar Hi2 and locates the gear casing 8i) so that the rotatable sleeve 81 supported therein is aligned with the shafts I02 and I25.

In order that the grinding wheels, the work piece and the master cam for actuating the truing tools may be rotated in absolute synchronism with each other, it is desirable to provide a backlash eliminating mechanism in the gear drive. Each of the gear drives contained in the gear box lit, gear box 98, and gear box H5 is provided with suitable means to eliminate any backlash so that the driven shafts are rotated in When 1 the gears and I35 are assembled, the spring 1 I38 is put under tension by rotating the gear I35 relative to the gear 85 and a pin I34 projecting from the gear 85 engages a slot in the hub of the gear I35 to hold the two gears with the spring I33 under tension while the assembly of the unit is completed. The slot in the hub of the gear 536 is wider than the pin I34, thus permitting a relative motion. between the gears I36 and 85, so that the tension of the spring I38 serves at all times, after the gears are meshed with the driving gears 83 and I35, to eliminate the backlash therebetween. I Similarly, each one of the gear sets is provided with a pin I34 which serves to lock the bevel gears with the backlash elimination spring under the desired tension before assembly of the individual gear units.

The gear box is provided with a backlash eliminator including a bevel gear I33 which is keyed to gear 9d and meshes with a gear Hill rotatably mounted on a hub of gear $5. A spring Ml serves to yieldably connect the gear Md with the gear as to eliminate any backlash between the shaft IE2 and the shaft 98.

The gear box H5 is provided with a similar backlash eliminator comprising a bevel gear I43 which is keyed to gear HIS by means of a bearing sleeve M9 for both gears and meshes with a bevel gear Hi4 which is rotatably mounted on. a

hub of gear II8. A spring I45 serves to yieldably connect the gear I4 3 with the gear M8 to elimi nate any backlash in the driving connections between shafts I2I and the master camshaft 89.

It is necessary to time the shaft 69 relative to the wheel spindle 25 and also to time the work rotation with the wheel spindle 25. These shafts may be roughly timed in assembly by positioning the bevel gears in the gear boxes 80, 99 and H5.

10 It is desirable, however, to provide a suitable adjusting mechanism so that the timing of the work piece 29 and the timing of the master camshaft 68 of the truing mechanism may be readily adjusted. This is preferably accomplished by providing an angular adjustment for the driving gears 94 and II9. Details of this adjustment for the gear H9 have been illustrated in Figs. 4, 5

and 6. The sleeve I 28 is formed with an integral flange I58, and gear H9 is rotatably mounted on a sleeve I49. The gear I I9 is locked to the flange I48 by means of screws I5I and I52 which pass through elongated slots I58 and I54 in the flange I 48 and are screw threaded into the gear III).

By tightening the screws I5I and I52, the gear H9 may be locked into driving relation with the flange M8.

In order to facilitate angular adjustment between the gear II9 and flange I 48, a pair of diametrically opposed screws I55 and I55 are provided. These screws are screw threaded into the gear H9 and are each provided with en larged heads having a frusto-conical surface I51 which is arranged to engage the frusto-conical surfaces I59 and I GI] in the flange I43. By loosen- 3,5. ing the screws I5I and I52 and then manipulating the adjusting screws I55 and I55, the gear II9 may be adjusted relative to the flange I IB so as to accurately time the rotation of the shaft 58 relative to the wheel spindle 25.

A similar adjusting mechanism is provided for timing the gear 94 relative to the shaft I82 and p the work head spindle 81. This mechanism is identical with that above described and consequently has not been illustrated in detail. A pair of opposed clamping screws I68 pass. through elongated slots in the flange I68 and are provided to clamp the gear 94 to the flange I54 which is formed integrally with the sleeve 9|. A pair of diametrically opposed adjusting screws I 85 and I66 serve to adjust the position of the gear 94 relative to the flange I84. After the gear has been adjusted, the flange and the gear are locked by means of the clamping screw I88 so that the rotation of the headstock spindle 91 is accurately timed with the wheel spindle 25 and also with the master camshaft B8 of the wheel truing apparatus 58.

The camshaft to be ground is rotatably supported between the headstock I8 and footstock 60 I9 on a headstock center I15 and a footstock center I155. The footstock may be of any of the well known constructions, such as that shown in the expired patent to Norton No. 762,838 dated June 14, 1904, in which the footstock center I15 is adjusted relative to the work piece by means of a hand wheel I11. The headstock drive for the work is preferably arranged so that the work may be removed from the machine without stopping the rotation of the headstock spindle 91. A sleeve I 19 is slidably mounted within the headstock spindle 91. The sleeve I19 carries a rotatable work driving head I 88 which is screw threaded onto the end of the sleeve I19. The work driving head I88 is connected by means of a a slot to a single tooth clutch I8I on the headstock spindle sleeve 91. A brake member I82 is carried by the head I88 and in the normal operation of the machine during grinding is inoperative and rides within an aperture I83 within the casing I 84. The member I82 is provided with a brake ring I85 which is arranged to engage a braking surface I85 on the casing I84. A spring I81 within the headstock sleeve 91 acts upon the head I 88 of a plunger I 89 and serves to exert a pressure tending to move the sleeve I19 toward the right, so as to maintain the center I15 in supporting engagement with the work piece 28, as viewed in Fig. 3. When the work is removed from the machine, the operator turns the footstock wheel I11 to withdraw the footstock center I15, and the released tension of the spring I81 serves to move the sleeve I19 and the head I88 toward the right, as viewed in Fig. 3, so that the single tooth clutch MI is disengaged, thereby disconnecting the drive to the head I88. The brake shoe I85 engages the braking surface I86 and thereby stops the rotation of the head I89 and work piece 28. The hand wheel I11 on the rootstock I9 is then rotated further to withdraw the footstock center I16 from engagement with the work, and the work piece may then be readily removed from operating position on the machine. The head I88 is preferably formed in two parts comprising a work driving member I90 having a dog tooth I8I which is arranged to engage a notch in the end of the work piece. The head IIIII is provided with a lug I82 carrying an adjusting screw I98 which is arranged to abut against a plate I of the driving member I89 so that the plate I9 5 may be adjusted by means of the screw relative to the head I89 to permit a further timing adjustment of the work piece relative to the rotation of the headstock sleeve 91 and the wheel spindle 25. The plate I94 may be locked in adjusted position by means of the clamping bolts I85 and I96 which are screw threaded into the head I 80 and pass through elongated slots I91,

gages the positioning lug I32 which is preferably formed integral with the base I9 and thereby aligns the rotatable sleeve 81 in the gear box 89. The driven shafts I92 and I2I are then slid into driving engagement with the sleeve 81 and the master camshaft 89 is then timed in the proper relation with the wheel spindle by manipulation of the adjusting screws I55 and I 55. The headstock spindle 91 is then timed in the desired relationship with the wheel spindle 25 by adjustment of the screws I55 and I65. The wheel spindle is then started in rotation and the grinding wheels are trued by turning the feed wheel 54 to move the slide 59 toward the grinding wheels, and wheel 88 is rotated to traverse the truing tools across the peripheries of the grinding wheels so as to generate the predetermined contour on the periphery of the wheels which is the conjugate of the shape to be ground on the portions of the work piece. The machine is then ready for the grinding operation and the operator inserts a work piece 29 on the head and footstock centers I15 and I18, turns the footstock wheel I11 to slide the sleeve I19 within the spindle 91 to disengage the braking disk I85 from the surface I86 and thereby start the work rotation. The workv as to generate a predetermined contour on the vided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may bemade of the above invention and as many changes might be made in the embodiments above set forth, it is to be understood that all matter hereinbefore set forth, or shown in the accompanying drawings, is to be interpreted as illustrative and notin a limiting sense.

I claim:

'1. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle to support said wheel, spaced bearing assemblies to support said spindle, said bearing assemblies having outer supporting surfaces, spaced aligned surfaces arranged to mate with and alignsaid bearing surfaces on the base, a rotatable work support, a transversely movable slide supporting one of said elements which is arranged fbr movement relatively toward and from the other, means to rotate the grinding wheel spindle, driving connections between the wheel spindle and the work support to synchronize the rotation thereof including gearing on the end of said wheel spindle, gearing on the end of said rotatable work support, a telescopic drive shaft between said sets of gears, said telescopic shaft being arranged so that it may be disconnected, and means to lock and hold said shaft dis-connected to facilitate removal of the grinding wheel spindle assembly.-

2. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle to support said wheel, a pair of spaced bearings for said spindle on opposite sides of said wheel, casings to support said bearings having outer sup:-

, porting and aligning surfaces, aligned spaced supporting surfaces for said bearing assemblies, a truing apparatus includinga truing tool, means to cause said truing tool to move longitudinally and transversely relative to the operative face of the grinding wheel, means including a rotatable cam and a drive shaft therefor to move the truing tool toward and from the operative face of the grinding wheel, disconnectable driving connections including a telescopic drive shaft between the grinding wheel spindle and the camshaft to synchronize the rotation of the grinding wheel and the truing tool cam so as to facilitate removal of the grinding wheel, and means to lock and hold said shaft disconnected to facilitate removal of the wheel assembly.

3. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle which is rotatably supported on said base, a truing tool, means including a rotatable cam to cause said truing tool to move toward and from the operative face of the grinding Wheel to true the same, means to synchronize the rotation of the wheel spindle and the camshaft including a transversely extending telescopic shaft, gearing connecting the wheel spindle and said transverse shaft, means to take up backlash in said gearing, driven gearing connecting the other end of said transverse shaft and the camshaft, and means to take up backlash in said gearing so as to rotate the cam in synchronism with the grinding wheel so wheel periphery.

4. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle which is rotatably supported on said base, a truing tool, means including a rotatable cam to cause the truing tool to move toward and from the operative face of the wheel to true the same, means to synchronize the rotationof said wheel spindle and camshaft including a transversely extending telescopic shaft, anti-backlash gearing connecting said wheel spindle and said transverse shaft, driven anti-backlash gearing connecting the other end of said transverse shaft and the camshaft to rotate the cam in synchronism with the grinding wheel soas to generate a predetermined contour on the wheel periphery, yieldable means to hold said telescopic shaft in a driving position, and means to withdraw and hold said telescopic shaft disconnected from the wheel spindle to facilitate removal of the grinding wheel assembly.

5. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle to support said wheel, bearings for said spindle, a rotatable work support including a rotatable headstock spindle, means to move the grinding wheel and the work support transversely and relatively toward and from each other, and means to rotate said headstock spindle in synchronism with said grinding wheel spindle including a transverse drive shaft, anti-backlash gear connections between the wheel spindle and the transverse shaft, gear connections between said transverse shaft and the headstock spindle, and means to adjust the timing between said grinding wheel 7 sembly and work support transverselyrelative to each other, driving connections between the wheel spindle and headstock spindle including a transverse drive shaft, gearing connected between the wheel spindle and said transverse shaft, a gearing between the transverse shaft and headstock spindle, a telescopic transverse drive shaft which is arranged so that it may be disconnected, and means to hold said telescopic drive shaft disconnected from the wheel spindle gearing to facilitate removal of the grinding Wheel assembly.

'7. A grinding machine comprising a base, a rotatable grinding wheel, a spindle to support said wheel, a rotatable work support, a slide supporting one of said elements for movement toward and from the other, means to removably support the grinding wheel spindle, means to rotate said spindle, a truing apparatus including a truing tool which is arranged to be moved transversely and longitudinally relative to the operative face of the wheel, means including a cam and a drive shaft to cause the truing tool to move toward and from the periphery of the wheel to true the same to a predetermined contour, and a driving mechanism to synchronize the rotation of the work support and the cam-shaft with the grinding wheel spindle including gearing on one end of said wheel spindle, gearing on the end of said rotatable work holder which is aligned with the gearing on the wheel spindle, gearing onrthe end of said camshaft which is aligned with the gearing on the wheel spindle, and a pair of telescopic driving shafts connecting the gearing on the wheel spindle with the gearing to rotate the work support and the gearing to rotate the truing tool cam.

8. A grinding machine comprising a base, a rotatable grinding wheel, a spindle to support said wheel, a rotatable work support, a slide supporting one of said elements for movement toward and from the other, means to removably support the grinding wheel spindle, means to rotate said spindle, a truing apparatus including a truing tool which is arranged to be moved transversely and longitudinally relative to the operative face of the wheel, means including a cam and a drive shaft to cause the truing tool to move toward and from the periphery of the wheel to true the same to a predetermined contour, and a driving mechanism to synchronize the rotation of the work support and the camshaft with the grinding wheel spindle including gearing on one end of said wheel spindle, gearing on the end of said rotatable work holder which is aligned with the gearing on the wheel spindle, gearing on the end of said camshaft which is aligned with the gearing on the wheel spindle, a pair of aligned spaced telescopic drive shafts connecting the gearing on the rotary work support with the gearing on the wheel spindle and connecting the gearing on the camshaft with the gearing on the wheel spindle, and means to telescope and hold said shafts within the respective gear mechanisms to disconnect the work support from the wheel spindle and to disconnect the cam from the wheel spindle drive to facilitate removal of the grinding wheel assembly.

9. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle to support said wheel, a work supporting table, means to move said table and wheel spindle relatively toward and from each other, a headstock and footstock mounted on said table, a continuously rotated spindle on said headstock, means to rotate said wheel spindle, driving connections between the wheel spindle and headstock spindle to synchronize the rotation thereof, a work supporting and driving head associated with said spindle which rotates with the headstock spindle during the grinding operation, a brake associated with said work driving head, and a single tooth clutch between the work driving head and the headstock spindle which is arranged so that when the work piece is mounted on centers and the rootstock is adjusted into an operating position the work driver is moved axially to release the brake and engage the clutch to start the rotation of the work.

10. A grinding machine comprising a base, a rotatable grinding wheel, a wheel spindle to support said wheel, a work table, means to cause a relative transverse feeding movement between the work table and wheel spindle, a headstock and footstock on said table, a headstock spindle, synchronous driving connections between the wheel spindle and headstock spindle to continuously rotate the headstock spindle, a work supporting and driving head associated with said spindle which rotates with the headstock spindle during the grinding operation, a brake associated with said work head, a single tooth clutch between the work drive head and the headstock spindle which is arranged so that when the work piece is mounted on centers and the footstock is adjusted into an operating position the work driver is moved axially to release the brake and engage the clutch to startthe rotation of the work and a locating device on said head to locate the work piece in a predetermined rotary position with respect to said wheel spindle and headstock spindle.

CARL G. FLYGARE. 

